Siemens Siprotec 7VK61 Manual page 101

Figure 2-24 Logic diagram of the overvoltage protection for zero sequence voltage
Freely selectable single-phase voltage
As the zero sequence voltage stages operate separately and independent from the other protective overvoltage
functions they can be used for any other single–phase voltage. Therefore the fourth voltage input U
device must be assigned accordingly (also see Section 2.1.3, „Voltage Transformer Connection").
The stages can be blocked via a binary input „>3U0>(>) BLK". Internal blocking is not accomplished in this
application case.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
2.5 Under and over-voltage protection (optional)
Functions
of the
4
101